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<http://schema.org/item>
<https://blog.wanichan.jp/archive/category/%E3%83%A9%E3%82%A4%E3%83%95%E3%82%B9%E3%82%BF%E3%82%A4%E3%83%AB>
<https://blog.wanichan.jp/entry/2021/12/17/122931>